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The PU, in liquid form is Injected into the closed mold (holding the upper) at high pressure.
The PU hardens and permanently fuses into one piece with the upper. There is absolutely no chance of separation.
Direct injection moulding or Direct Moulding points to the fact, that the soles are moulded directly onto the upper without use of adhesives or stitching.
This is possible because of the dramatic speed at which monomers polymerise to form network polyurethane, a process that is so rapid, that articles may be fabricated by injecting the reacting monomers directly into a mould.